/*
 * Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include <arch.h>
#include <assert.h>
#include <cci.h>
#include <debug.h>
#include <mmio.h>
#include <stdint.h>

static uintptr_t g_cci_base;
static unsigned int g_max_master_id;
static const int *g_cci_slave_if_map;

#if ENABLE_ASSERTIONS
static int validate_cci_map(const int *map)
{
    unsigned int valid_cci_map = 0;
    int slave_if_id;
    int i;

    /* Validate the map */
    for (i = 0; i <= g_max_master_id; i++) {
        slave_if_id = map[i];

        if (slave_if_id < 0)
            continue;

        if (slave_if_id >= CCI_SLAVE_INTERFACE_COUNT) {
            ERROR("Slave interface ID is invalid\n");
            return 0;
        }

        if (valid_cci_map & (1 << slave_if_id)) {
            ERROR("Multiple masters are assigned same slave interface ID\n");
            return 0;
        }
        valid_cci_map |= 1 << slave_if_id;
    }

    if (!valid_cci_map) {
        ERROR("No master is assigned a valid slave interface\n");
        return 0;
    }

    return 1;
}
#endif /* ENABLE_ASSERTIONS */

void cci_init(uintptr_t cci_base,
        const int *map,
        unsigned int num_cci_masters)
{
    assert(map);
    assert(cci_base);

    g_cci_base = cci_base;

    /*
     * Master Id's are assigned from zero, So in an array of size n
     * the max master id is (n - 1).
     */
    g_max_master_id = num_cci_masters - 1;

    assert(validate_cci_map(map));
    g_cci_slave_if_map = map;
}

void cci_enable_snoop_dvm_reqs(unsigned int master_id)
{
    int slave_if_id;

    assert(g_cci_base);
    assert(master_id <= g_max_master_id);

    slave_if_id = g_cci_slave_if_map[master_id];
    assert((slave_if_id < CCI_SLAVE_INTERFACE_COUNT) && (slave_if_id >= 0));

    /*
     * Enable Snoops and DVM messages, no need for Read/Modify/Write as
     * rest of bits are write ignore
     */
    mmio_write_32(g_cci_base +
              SLAVE_IFACE_OFFSET(slave_if_id) +
              SNOOP_CTRL_REG, DVM_EN_BIT | SNOOP_EN_BIT);

    /* Wait for the dust to settle down */
    while (mmio_read_32(g_cci_base + STATUS_REG) & CHANGE_PENDING_BIT)
        ;
}

void cci_disable_snoop_dvm_reqs(unsigned int master_id)
{
    int slave_if_id;

    assert(g_cci_base);
    assert(master_id <= g_max_master_id);

    slave_if_id = g_cci_slave_if_map[master_id];
    assert((slave_if_id < CCI_SLAVE_INTERFACE_COUNT) && (slave_if_id >= 0));

    /*
     * Disable Snoops and DVM messages, no need for Read/Modify/Write as
     * rest of bits are write ignore.
     */
    mmio_write_32(g_cci_base +
              SLAVE_IFACE_OFFSET(slave_if_id) +
              SNOOP_CTRL_REG, ~(DVM_EN_BIT | SNOOP_EN_BIT));

    /* Wait for the dust to settle down */
    while (mmio_read_32(g_cci_base + STATUS_REG) & CHANGE_PENDING_BIT)
        ;
}

